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六级听力真题：2011年12月英语六级复合式听写原文
In the past, one of the biggest disadvantages of the machines has been their inability to work on the micro scale .For example, doctors did not have devices allowing them to go inside the human body to detect health problems or to perform. delicate surgery. Repair crewsdid not have a way ofidentifying broken pipes ,located deep within the highrise of apartment building .however ,that’s about to change .Advances in computers and biophysics have started a microminiature revolution that allows scientists to invasion and in some cases actually buildmicroscopic machines .this devices promise to dramatically change the way we live and work .Micro machinesalready aremakingan impact . An case Western Reserve University in Cleveland, Ohio , research scientists have designed a 4inch Silicon chip that hold 700 tiny primitive motors at Lucas..M sensor Center California .Scientists have perfected the world first microscope blood pressure sensor。
threaded through a persons’ blood vessels. the sensor can provide blood pressure readings at the wow of the heart itself .Although simple versions of miniature devices have hadan impact . advanced versions had still several years away . Auto